This discipline relies on a greater understanding of the chemical structure and the pharmacological/toxicological effects of essential oils, to suggest safe dosage levels and contra-indications for use.
In this presentation, I will explore the range of recommendations made and address the validity of each, especially addressing the underlying assumptions and reasons for these statements.
We should consider (outside of ethical considerations - but no effective substitute has yet to be found) that such tests generally are based on either acute oral (by mouth) or injected lethal doses.
This means that the LD50 dose represents the median toxic dose taken all at one time, either by ingesting or by direct injection of the test compound.
The vast majority of Aromatherapy books are written for the lay public.
In this regard, care is taken to recommend dosages and essential oils that will neither create negative reactions nor lawsuits.
In contrast, we can say the French "Aromatic Medicine" approach that has developed most strongly amongst French medical practitioners (as well as naturopathic and herbal medicine practitioners) since R. Gattefosse's work in the 1930's, is more of a "physical" approach.